And chas



UNITED STATES PATENT OFFICE.

SELAH HILL, OF JERSEY CITY, NEIN JERSEY, AND CHAS. M. DUPUY, JR., OFRONDOUT, NEW YORK.

DERRICK.

Specification of Letters Patent No. 9,025, dated June 15, 18.52.

To all whom it may concern.'

Be it known that we, SELAH HILL, of Jersey City, in the county of Hudsonand State of New Jersey, and CHARLES M. DUPUY, J r.,

of Rondout, in the county of Ulster and State of New York, have inventedcertain new and useful Improvements in Derricks and Similar Contrivancesfor Raising IVeights; and we do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe accompanying drawings, in which- Figure l, is a side elevat-ion of aderrick with our improvements, Fig. 2, is a front elevation, and Fig. 3,is a plan of the same,

Fig. 4, exhibits the sectional form of the jib on an enlarged scale.

Similar letters of reference indicate corresponding parts in each of theseveral figures.

This invention consists in placing the axis upon which the jib of aderrick, crane, or similar apparatus, swings, in a position slightlydeviating from the vertical, by which means, with a proper arrangementof hoisting tackle, the jib can be swung,'and its describe fully itsconstruction and operation.

A, is the mast of the derrick, which is stepped at its lower end, in aplatform B, which may either be fixed or movable; it is stayed to aboutone third of its height by four inclined timber braces C, C. Close abovethe top of the braces C, C, a platform D, extending all around, is irmlysecured; and above the platform D, there is another platform E; theseplatforms serve as stages upon which to stand to arrange the tackles,

and form at the same time part of the means by which the mast is stayed,as will be hereinafter described.

F, is the jib, or as it is sometimes termed,

the boom of the derrick; its inner end is furnished with an eye a, whichfits easily on a small pivot o, secured in the lower platform, and itsouter end is suspended by a tackle o, c, to the cap G, of the mast; thusthe axis upon which t-he jib swings is in an imaginary line, runningthrough the pivot o, and the point of suspension cl, of the tackle c,0,' this imaginary line is indicated in Fig. 2, in red color, and itwill be seen, is not vertical,

inclining at the top toward the right. This inclination of the axiscauses the jib to swing to the right by its own gravity, when not heldand secured in another position.

The weight to be raised, represented by H, in the drawing, has two ropesor tackles e, and f, attached to it. These may however be parts of thesame rope, the hook or other means of attaching the weight being securedto the rope so as not to slide. The tackle e, passes through a pulleyblock g, hung under the outer end of the jib, then through anotherpulley block h, attached to the side of the jib near the pivot Z2, andthen through a pulley block z', hung on a spar I, secured to theplatform D, or to the mast, from whence the fall descends to a windlass,capstan, or to any lifting power, or is hauled by men, or drawn by ahorse or other animal. The other tackle f, passes through a pulley blockj, suspended from the cap G of the mast and its fall descends to awindlass, or capstan, or is by other means hauled upon, in a similarmanner to e.

The weight is raised by hauling on either fall e, or f; the dierencebeing that e, draws it out, toward the end of the jib, and. f, draws itin toward the mast, so that both falls must be hauled on to raise theweight vertically. Either or both falls will be hauled upon in working,according as the superintendent may direct. In hauling on e, at the sametime that the weight is raised, the jib will swing toward the left handor in the direction of the arrow shown in Fig. 3; and in slacking outthe fall e, it will swing in the opposite direction.

The power required to overcome the tendency of the jib to swing belowits axis, is very small, owing to the smallness of the deviation of theaxis from the vertical position; therefore a very slight haul on thefall e, when the weight is suspended, will, by drawing the pulley h,nearer to i, swing the jib in the direction of the arrow, without at allraising the weight. In like manner, by gently slacking the fall, the jibwill swing back without lowering the weight. In raising or removingheavy weights, this mode of hanging the jib is of incalculableadvantage, from its convenience, as the jib may be swung in anydirection, and the weight raised from or deposited on any point, withinthe semi-circle described by its end, by the lifting tackle alone,without any separate swinging apparatus. This enables the derrick to beworked with less hands, and the controlling power is centralized7 as allits operations are governed from one point. The jib when hung, can onlyswing half way around the mast, but it can be removed from one side tothe opposite one; in that case there must be a. pivot Z), on theopposite side of the platform D, and the fall c, c, can be attached tothe opposite side of the cap Gr; the spar I, must then be placed on theopposite side of the mast and turned in the opposite direction. By thusreversing the positions ot' the parts, the derrick will work in acomplete circle without moving the platform or mast. The end of the jibmay be raised or lowered by the tackle c, c, to alter its inclination;the fall of c, c, being made secure to any convenient fastening to holdup the jib.

The mast is stayed from top to bottom by two wro-ught iron tension rodsc, 7c, which pass over the top and do-wn the sides, the two ends of eachpassing through a plate J, under the bottom, and being screwed andfurnished with nuts below the plate, resting against the stages D, andE, which act as thrust posts. By tightening up the nuts on these rodsthe mast is stayed e'ffectually on the two sides. There are two rods Z,Z, one

in front and one behind, each formed in two parts, one part beingsecured to the cap and the other' below the plate J, the two parts beingunited by a swivel nut m; these rods bear on the 'edges of the platformsand act in a similar manner to 7c, 7c, being tightened up by the swivelnuts m, m. One of them must always be unco-upled to allow the jib towork, though the staying is unnecessary on the side where the jib hangs,but is required on the opposite side.

The jib is made of `two stringers n, n, of timber of bowed form, withcross braces 0, 0, between them at intervals. Thrust posts p, p, areplaced above and below the braces 0, o, and tension rods g, g, run fromend to end of the jib, bearing on the ends of the posts p, y?, and beingtightened by any convenient means. This mode of staying the jib is thesame as that applied to the mast.

What we claim as our invention and desire to secure by Letters Patent,is

Placing the axis upon which the jib F, swings, in a position deviatingfrom the vert-ical, so as to cause the jib to have a tendency to swingin one direction, and applying the hoisting tackle, or part ot thehoisting tackle, in any manner substantially as described to the sideopposite to the direction in which the jib tends to swing, so as to makethe hauling on the said tackle, or part of the tackle, swing the jib inthe opposite direction to that in which is its tendency to swing whenleft free.

SELAH HILL. CHARLES M. DUPUY, JR.

Witnesses S. H. WALES, O. D. MuNN.

